What the hell is going on with the penis in the left frame of the penultimate row?

Defense mechanism.

It's twitching before ejaculating. Read vertically, starting from the rightmost column.

Premature ejaculator?

GordonFreeman said:
Defense mechanism.

You win 5 internets.

Would love to see an animated gif of this...might be kind jumpy frame-to-frame, but worth a try :D

scroll down really fast. it looks real

well... so much for not fapping today